Analytics show zero visits the past week?

My site went from having 100-200 visits a day to showing zero visits a day this past week. Today was the first time I saw this but I checked and it is still in the index so I know it wasnt blacklisted or anything. What could the problem be? In Webmaster tools it updated 2 days ago as far as showing that it was crawled so I dont know what the problem could be?

I've had this happen a few times. I just simply readded the code and it worked after 24 hours. Trevor, you've had to actually apply for a new code before?? That's a scary thought regarding losing historic data.